/Engine/Source/Runtime/MovieScene/Public/MovieSceneSpawnRegister.h
Called to handle cleanup of objects when we convert a possessable to a spawnable object
virtual void HandleConvertPossessableToSpawnable ( [UObject](API\Runtime\CoreUObject\UObject\UObject) * OldObject, [IMovieScenePlayer](API\Runtime\MovieScene\IMovieScenePlayer) & Player, [TOptional](API\Runtime\Core\IO\TOptional)< [FTransformData](API\Runtime\MovieScene\FTransformData) > & OutTransformData )